As long as BF3 doesn't crash (which is more reliable than any stability test) then you're good. My 3570K is stable as 4.50Ghz @ 1.200V.

BF3 isn't a realiable stability tester. It is so buggy that sometimes it crashes without a reason. That or me and all of my friends have faulty gpus/cpus @stock. I've gotten a few random crashes without any overclocking, so just stick to prime/ibt/other games for stability testing.